Love the armless sofa-bench! Try using it in the center as a "cross-linking" piece between the sofa and chairs. That way people can sit on both sides of it, conversing with the sofa people and the chair people. Put the chairs where it is and use the side table from the left of the pic, or the one with flowers, between them. You'll need one huge rug to anchor the space or two smaller, and very similar ones, to put on either side of the blue sofa-bench. The other two side tables are too tall and too short for your seating pieces, so ditch them. Use your coffee table between the sofa and armless sofa (18" away from each of them.) Here's a chart for judging table and lamp heights as you'll need to work on that for balance. Please try this arrangement, and post by commenting and using the Attach Images button to add pix of the update. We'll tweak it on out from there.

well i do trust him....but I m just concerned about the wallpapers....haven't really used them nor have seen anyone with that in the locality.....that's all....

There are many kinds of accent walls and when you get it right- magic. Factor in how detailed you go, as little girls change into big girls in a blink of an eye. And then you are grabbing for a paint brush again, with a dark paint on the wall- that requires lots of primer and coats of paint to cover. Give us more detail if you need more specific advice... Furniture...color scheme... Bedding... Space... Childs age....

It is my understanding you are not going around the corner but on 2 opposites sides of the space . The only thing i would be concerned with is your bedding and if you want to hang art on the wallpapered wall. Ilike the wallpaper and I would choose the lighter green and maybe try and find some faux silk drapes in that color . A nice crisp white matlesse with a lime throw and lime, blue and white and maybe a bit of pink pillows would be nice